Decorative gemstone



FIG. 1 is a top view of first embodiment of the present invention;

FIG. 2 is a side view of the first embodiment, with the opposite side view being similar;

FIG. 3 is a bottom view of the first embodiment; and,

FIG. 4 is a perspective view of the first embodiment. 

The ornamental design for decorative gemstone, as shown and described. 